Manometer.



1. H. COTTON. "MANOMITER. APPLICATION FILED OCT. I. 1915.

Patented Spt. 11, 191?.

JAMES H. COTTON, 0F TORONTO, ONTARIO, CANADA.

MANOIVIETER.

To all whom t may concern:

Be it known that 1, JAMES HENRY COT- TON, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province ofI Ontario, in the Dominion of Canada, have invented cert-ain new and useful Improvements in Manometers, as described in the following specification and illustrated in the accompanying drawings,

that form part of the same.

The principal objects of the invention are, to devise a form of manometer from which theindicating fluid cannot escape or in which the iuid cannot become contaminated, and further to devise a neat and accurate instrument which may be always relied upon.

The principal featurev of the invention consists in the novel formation of a gage tube and bulb for containing the indicating fluid, whereby the air opening in the bulb leading from the pressure tube and the air vent opening at the top of the indicator tube are trapped to prevent the outflow of the indicating fluid but allow the free flow to the air.

ln the drawings, Figure 1 is a front elevational view of a manometer constructed in accordance with this invention.

Fig. 2 is a vertical mid sectional side view of the device.

Like numerals of reference indicate corresponding parts in each ligure.

Referring to the drawings, 1 is the indicator tube adapted to contain a mercury column and having formed at its bottom end a bulb 2 adapted to contain a supply of mercury 3.

4 is an extension end of the tube 1 projecting downwardly into the bulb 2 and terminating close to the bottom thereof, the capillary passage 5 opening through the extremity.

6 is a tube formed integral with the bulb 2 and extending inwardly and terminating intermediate of the length of the bulb and spaced from the inner wall and apart from the tube l.

The'tube 6 is formed in the shape of a capillary tube and the outer end 7 thereof is connected to the air pressure tube 8 leading from the pressure band with which the gage is used.

9 is a bulb formed on the upper end of the tube 1 and open to the mercury column passage 5.

Specification of Letters Patent.

Patented Sept. 11, 1917.

Application filed. October 1, 1915. Serial No. 53,527.

10 is a capillary tube formed in the bulb 9 and lextending inwardly from one of the side walls, the passage 11 forming an air vent to release the air from within the passage 5 and bulb 9, as the mercury column rises. l'llhe tube 1 is here shown divided intermediate of its length, being formed with a suitable tapered joint 12 to allow of its being separated for convenience in carrying.

13 is a suitable gage here shown secured to the tube 1 and having suitable graduations thereon and adapted to indicate through the mercury column the pressure applied in the bulb and consequently in the pressure band.

The device is particularly adapted to obviate the annoyance due to the loss or contamination of the indicating fluid. The fluid when once placed within the bulb is positively prevented from flowing outward through either of the tubes l or 6 as such tubes are formed with very fine pas- 'sages and the capillary action depresses the mercury so that when pressure is released the mercury .will be evacuated from the tube. While the tube is shown divided in the drawings it is really preferable to form it in a single length. It is then absolutely proofI against any possibility of loss, for the passage 11 leading from the bulb 9 is a fine capillary passage and if the pressure applied within the bulb 3 causes the mercury to flood over the top of the column it merely flows into the bulb 9 and cannot escape therefrom, though a free exit is allowed to the air. The mercury being thus inclosed and free from possibility of escape is kept perfectly clean and does not require renewal or cleansing but will last indefinitely retaining its proper faculties.

What I claim as my invention is A manometer, comprising a glass tube having its lower end reduced to form a capillary passage, a glass bulb surround- J. H. COTTON.

@epica of this patent may be obtained for ve cents each, by addressing the Qemmissioner of Patents, Washington, il?. Q. 

